Etymology
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ratify (v.)

mid-14c., ratifien, "confirm, approve, sanction, validate by formal act of approval," from Old French ratifier (13c.), from Medieval Latin ratificare "confirm, approve," literally "fix by reckoning," from Latin ratus "fixed by calculation; determined; approved; certain, sure; valid" (past-participle adjective from reri "to reckon, think;" from PIE root *re- "to reason, count") + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Related: Ratified; ratifying.

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Definitions of ratify

ratify (v.)
approve and express assent, responsibility, or obligation;
All parties ratified the peace treaty
Synonyms: sign
From wordnet.princeton.edu